#374B91
Closest named color: Dusk Blue (#26538D). oklch(43.4% 0.118 269.1), rgb(55, 75, 145).
Aa
White text reads best on this color (8.14:1).
About this color
#374B91 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.118 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.028 away. White text reads best on it, at 8.14:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.57:1 |
| White text | 8.14:1 |
Values
| HEX | #374B91 |
| RGB | rgb(55, 75, 145) |
| HSL | hsl(227, 45%, 39%) |
| OKLCH | oklch(43.4% 0.118 269.1) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #374B91 | 8.14:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #374B91 | 2.57:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #374B91 text on white | 8.14:1 | AAA | Lc 88.0 | Fine for body text |
| #374B91 text on black | 2.57:1 | Fails | Lc -14.2 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CFD9F3
oklch(88.6% 0.037 268.9)
-
Step 300
300
#AEBFEE
oklch(80.8% 0.069 269.3)
-
Step 400
400
#859DE6
oklch(70.7% 0.111 269.5)
-
Step 500
500
#6783DE
oklch(63% 0.141 269.2)
-
Step 600
600
#4F6BCC
oklch(55.6% 0.153 268.9)
-
Step 700
700
#4159B0
oklch(49.2% 0.141 269.1)
-
Step 800
800 (this color)
#374B91
oklch(43.4% 0.118 269.1)
-
Step 900
900
#2E3E72
oklch(37.8% 0.091 268.9)
-
Step 950
950
#1B2443
oklch(26.9% 0.059 269.9)
#374B91 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #295494 | 0.027 |
| Deuteranopia (no green cones) | #1A4C90 | 0.028 |
| Tritanopia (no blue cones) | #005B67 | 0.102 |
| Achromatopsia (no color) | #4F4F4F | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374B91
#374B91
oklch(43.4% 0.118 269.1)
- #654E00
#654E00
oklch(43.6% 0.089 89.1)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #374B91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.028
- Cobalt #1E488F ΔE 0.029
- Blueberry #464196 ΔE 0.033
- Twilight #4E518B ΔE 0.040
- Light Navy #155084 ΔE 0.041
- Dark Slate Blue #483D8B ΔE 0.042
- Denim Blue #3B5B92 ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.048
Use #374B91 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.